Bird cage



FIG. 1 is an isometric view of the bird cage of this invention;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a right side elevation view thereof; and,

FIG. 7 is a rear elevation view thereof. 

The ornamental design for a bird cage, as shown. 